synctube: added synctube as w2g alternative

wiki/docker-images/rblsb_-_synctube.md

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+# rblsb - synctube
+
+The official container and documentation was made by [rblsb](https://github.com/rblsb/synctube).
+There is no official pre-build on docker-hub.
+
+## Set-up for building process
+
+First of all create a folder for your `rebuild.sh`.
+After that clone synctube from github into a folder within the just created folder.
+Then build the image inside the git folder with `docker build -t synctube .`.
+
+## Volumes
+
+Set the following volumes with the -v tag.
+
+| Volume-Name | Container mount     | Description         |
+| ----------- | ------------------- | ------------------- |
+| `synctube`  | `/usr/src/app/user` | Configuration files |
+
+## Ports
+
+Set the following ports with the -p tag.
+
+| Container Port | Recommended outside port | Protocol | Description |
+| -------------- | ------------------------ | -------- | ----------- |
+| `4200`         | `4200`                   | TCP      | WebUI       |
+
+## Rebuild
+
+```shell
+#!/bin/sh
+docker stop synctube
+docker rm synctube
+docker run --name synctube \
+        --restart unless-stopped \
+        -p 4200:4200 \
+        -v synctube:/usr/src/app/user \
+        -d synctube
+```